A massive chunk of Antarctica’s fastest-moving ice stream, the Pine Island Glacier, dropped into the Amundsen Sea this week, nearly two years after scientists first observed a crack in the glacier tongue.READ MORE

A NASA satellite image captured the first crack on the Pine Island Gglacier in October, 2011. At that time, the crack was about roughly 24 kilometers long and 50 meters wide. Just before the iceberg calved from the glacier this week, the gap had widened to 540 meters at its widest point, and the entire iceberg measured 720 square kilometers, or 278 square miles. (Courtesy of Alfred Wegener Institute/German Space Agency)

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Photographer Robert Wintner documents the exquisite beauty and biodiversity of Cuba’s coral reefs, which are largely intact thanks to stifled coastal development in the communist nation. View the gallery.

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